"This can be quite annoying. For example, AdBlockPlus
is extremely popular as an extension for blocking pop-up ads and
banners, but (sometimes unintentionally) there are quite a few
Firefox extensions that disrupt it, drawing regular complaints from
people trying new extensions, or upgrading existing ones. Mozilla
is now proposing a set of policies to police this problem, prompted
by a recent catfight between extension developers. The proposed
policy changes raise questions about just how much freedom
extension developers should enjoy."
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